Shall have to check Christine,can't find many images in my books,Gulliver's 1850-1914 has what I think is a perfect description,page 74,the paragraph on opalescent glass,in particular the 'dip-mould' reference.In regards to M's comment on 'Pulled up' machine I don't think it is but is this?A Webb vase(1935-49) that has small 'v' shaped marks three quarters of the way down the body

Thanks Christine,I take it those marks,difficult to tell from photos,on the 'osiris' pieces are left by the 'teeth' from the pulled up machine?if so what technique is used to create the marks on the Webb vase? sorry for all the questions